An automatic knife sharpener

Abstract

The utility model relates to a knife sharpening technical field, and disclose an automatic knife sharpening device, including the knife rest of installation for the knife edge part of cutting knife is used to the knife sharpening assembly of grinding, the knife sharpening assembly includes the electromagnet and the knife sharpening stone of knife rest installation through the knife sharpening support, the knife sharpening stone is opposite with the knife edge part of cutting knife and is adjusted the interval of both through the electromagnet, the utility model discloses the interval of the knife sharpening stone and cutting knife is adjusted through the electromagnet, when electrifying, electromagnet core drives push rod and makes the knife sharpening stone close to the knife edge, after power off, reset under the spring action, need not stop the machine to complete grinding, can greatly shorten the knife sharpening time to improve equipment utilization and processing efficiency, and then improve actual capacity, also avoid the body injury and the dust inhalation etc. safety hidden danger brought by manual stop operation simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of knife sharpening technology, specifically to an automatic knife sharpening device. Background Technology

[0002] In the field of machining, such as the tool maintenance of CNC cutting machines and automatic cutting machines, traditional manual tool sharpening methods suffer from low production efficiency and significant safety risks due to technical defects. Specific problems are as follows:

[0003] 1. Downtime for sharpening tools is time-consuming and results in low equipment utilization.

[0004] Traditional manual sharpening requires a complete shutdown of the machine, and each sharpening operation on a single CNC cutting machine takes a long time. Especially in continuous production scenarios, frequent shutdowns for sharpening can lead to significant production losses.

[0005] 2. Manual operation poses significant safety hazards and a high risk of workplace injuries.

[0006] When a hand-held grinder is used for grinding near a high-speed rotating cutter, it is easy for hands to get caught in the grinding machine. In addition, the concentration of metal dust (particle size ≤ 5μm) generated during grinding can reach 15mg / m³, which exceeds the national standard (8mg / m³) by 1.8 times. Long-term exposure can lead to pneumoconiosis and affect the health of workshop workers.

[0007] In summary, current sharpening methods are not only time-consuming and labor-intensive, but also pose safety hazards and require long downtime for maintenance, thus delaying actual processing efficiency. Therefore, this application proposes an automatic sharpening device to solve the above problems. Utility Model Content

[0008] To address the technical problems existing in the background art, this utility model proposes an automatic knife sharpening device.

[0009] The present invention proposes an automatic knife sharpening device, including a knife sharpening assembly mounted on a knife holder for sharpening the cutting edge of a cutting knife. The knife sharpening assembly includes an electromagnet and a sharpening stone mounted on the knife holder via a sharpening bracket. The sharpening stone is opposite to the cutting edge of the cutting knife and the distance between the two is adjusted by the electromagnet.

[0010] To address the issues of time-consuming and safety hazards associated with traditional manual knife sharpening, this design utilizes an electromagnet to automatically adjust the distance between the sharpening stone and the cutting blade. When the electromagnet is energized, it generates magnetic force, driving the sharpening stone close to the cutting edge for sharpening. When the power is off, the magnetic force disappears, and the sharpening stone returns to its original position. This design allows for sharpening without stopping the machine, significantly reducing the time required for each sharpening cycle, improving equipment utilization, and avoiding the safety risks associated with manual contact with rotating blades.

[0011] As a further optimization of this utility model, an electromagnet core is installed inside the electromagnet, and the electromagnet core can approach the cutter when energized or move away from the cutter when de-energized. The end of the whetstone away from the cutting edge of the cutter is connected to the free end of the electromagnet core extending to the outside of the electromagnet via a push rod.

[0012] The electromagnet core is made of soft magnetic material. When energized, it is magnetized and drives the push rod to move. The push rod is rigidly connected to the whetstone to ensure that the whetstone moves synchronously with the electromagnet core. The feed speed during grinding is controllable, avoiding excessive feed that could cause the cutting edge to overheat and anneal.

[0013] As a further optimization of this utility model, one end of the push rod is connected to the whetstone, and the other end of the push rod is connected to the electromagnet core through a connecting rod;

[0014] The connecting rod adopts a hinge structure, which allows for a small angular deviation between the push rod and the electromagnet core, compensating for installation errors. The connection strength between the connecting rod and the electromagnet core reaches 50N, which can withstand the reaction force during grinding and ensure stable feeding of the grinding stone.

[0015] As a further optimized solution of this utility model, one end of the connecting rod is flat and is inserted into and locked into the slot of the free end of the electromagnet core, and the other end of the connecting rod is ring-shaped and is snapped into the push rod and locked with bolts.

[0016] The flat plug-in structure forms a precise position with the slot, and the ring-shaped snap-fit ​​structure fixes the push rod with bolts. When disassembling, the push rod can be quickly replaced simply by loosening the bolts.

[0017] As a further optimization of this utility model, a fixing bracket for supporting the push rod is installed on the sharpening bracket. The fixing bracket has a through hole adapted to the push rod. The end of the push rod away from the connecting rod slides through the through hole and is rotatably connected to the tail of the sharpening stone.

[0018] The through-hole of the mounting bracket provides guidance for the push rod, ensuring that the sharpening stone moves in a straight line. One end of the sharpening stone is equipped with a rotating shaft, allowing the sharpening stone to rotate 360°. The other end of the rotating shaft is threadedly connected to the push rod, so that after the sharpening stone is installed, it can rotate along with the cutting blade under the rotational force. This not only sharpens the cutting blade but also effectively prevents localized wear caused by the fixed installation of traditional sharpening stones, thereby improving the service life and sharpening uniformity of the sharpening stone. Moreover, this design also facilitates the quick disassembly and replacement of the sharpening stone.

[0019] As a further optimization of this utility model, a first spring is fitted on the push rod, and the two ends of the first spring are respectively connected to the end faces of the connecting rod and the fixing frame.

[0020] The first spring provides the restoring force, which pushes the push rod to reset the grinding stone when the power is off, while also buffering the impact vibration during grinding. The spring compression can be controlled by adjusting the position of the connecting rod to adapt to different grinding pressure requirements.

[0021] As a further optimization of this utility model, both ends of the first spring are equipped with movable rings, and the two movable rings abut against the end faces of the connecting rod and the fixing frame, respectively.

[0022] The movable ring prevents the first spring from tilting during compression, ensuring uniform transmission of elastic force. The movable ring contacts the end face to avoid localized stress concentration that could lead to spring failure and extend the spring's service life.

[0023] As a further optimization of this utility model, the free end of the electromagnet core has an annular step, and the annular step surface is connected to the end face of the electromagnet by a second spring.

[0024] The second spring, together with the first spring, forms a double buffer, further reducing vibration during grinding. The annular step limits the maximum displacement of the electromagnet core, preventing excessive feeding of the whetstone from damaging the cutting edge.

[0025] As a further optimization of this utility model, the end of the whetstone near the cutting edge of the cutter is a grinding head, the cutter is a disc-shaped tool, and the included angle between the grinding head and the disc of the cutter is an obtuse angle and the angle is adjustable.

[0026] The angle between the grinding head and the cutting tool can be adjusted within the range of 100°-150° to accommodate different types of disc cutters. The obtuse angle design reduces frictional heat during grinding and prevents the cutting edge hardness from decreasing.

[0027] As a further optimization of this utility model, the grinding bracket is installed on the side of the tool holder via a rotating shaft and the rotation angle is fixed by fasteners;

[0028] The rotating shaft, in conjunction with fasteners, enables precise adjustment of the grinding angle. This design supports quick switching between different tool grinding processes, such as switching from saw blade grinding to milling cutter grinding, with a short adjustment time, greatly improving the equipment's versatility.

[0029] The automatic knife sharpening device proposed in this utility model has the following beneficial effects:

[0030] (i) This application uses an electromagnet to adjust the distance between the whetstone and the cutting blade. When the power is on, the electromagnet core drives the push rod to bring the whetstone close to the cutting edge. After the power is off, it is reset under the action of the spring. Grinding can be completed without stopping the machine, which can greatly shorten the grinding time, thereby improving the equipment utilization and processing efficiency, and thus increasing the actual production capacity. At the same time, it avoids the safety hazards such as limb injury and dust inhalation caused by manual machine stop operation.

[0031] (ii) The first spring on the push rod and the second spring of the electromagnet core form a double buffer to avoid rigid collision between the whetstone and the cutting tool. At the same time, the locking of the slot between the connecting rod and the electromagnet core and the through hole guidance between the push rod and the fixing frame can improve the displacement accuracy of the whetstone, thereby reducing the roughness of the cutting edge after grinding and improving the service life of the tool.

[0032] (III) The grinding head and the cutting disc are adjusted by a rotating shaft to make the grinding head obtuse angle with the cutting disc adaptable to different types of disc cutting tools. There is no need to replace the grinding components, saving debugging time. Moreover, the tail of the grinding stone is rotatably connected to the push rod. Under the rotational force of the cutting tool, the grinding stone can rotate with it. While grinding the cutting tool, it can also effectively prevent local wear caused by the fixed installation of traditional grinding stones, thereby improving the service life of the grinding stone and the uniformity of grinding.

[0033] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of the grinding assembly of this utility model.

[0036] Figure descriptions: 1. Tool holder; 2. Cutting knife; 3. Electromagnet; 4. Sharpening stone; 5. Sharpening support; 6. Electromagnet core; 7. Push rod; 8. Connecting rod; 9. Bolt; 10. Fixing bracket; 11. Movable ring; 12. First spring; 13. Second spring. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0038] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] In the field of machining, the problem of blade dulling during the use of cutting tools is common. Traditional manual sharpening methods are not only inefficient but also pose safety hazards. The automatic sharpening device provided by this utility model achieves online automatic sharpening of cutting tools through an innovative design of electromagnet drive and spring buffer. Its specific implementation method is as follows:

[0040] like Figure 1 and Figure 2 As shown, the device is based on the tool holder 1. An electromagnet 3 and a whetstone 4 are installed through a whetstone bracket 5. An electromagnet core 6 is installed inside the electromagnet 3. Its free end is connected to a push rod 7 through a connecting rod 8. The other end of the push rod 7 is fixed to the whetstone 4. The fixing bracket 10 on the whetstone bracket 5 provides guidance for the push rod 7. A first spring 12 is installed on the push rod 7. A second spring 13 is installed between the electromagnet core 6 and the electromagnet 3 to form a double buffer structure.

[0041] When the electromagnet 3 is energized, the electromagnet core 6 is magnetized and moves forward against the resistance of the first spring 12 and the second spring 13. Through the push rod 7, it drives the whetstone 4 to approach the cutting edge of the rotating cutter 2. At this time, the grinding head and the disc-shaped cutter 2 form an obtuse angle of 100°-150°. This angle is adjusted by the rotating shaft of the grinding bracket 5 and fixed by fasteners to ensure that the cutting edge temperature does not exceed 200° during grinding and to avoid annealing and softening.

[0042] When the electromagnet 3 is de-energized, the first spring 12 and the second spring 13 work together to push the push rod 7 and the electromagnet core 6 to reset, and the whetstone 4 separates from the cutter 2. The double spring structure can control the vibration amplitude during grinding to within 0.05mm, ensuring that the surface roughness Ra of the blade is ≤1.6μm, which is 30% higher than that of traditional manual sharpening.

[0043] like Figure 2 As shown, one end of the connecting rod 8 is inserted into the slot of the electromagnet core 6 in a flat shape and then locked with a bolt. The other end is engaged with the push rod 7 in a ring shape, allowing an angular deviation of ±2°. While compensating for installation errors, it can withstand a grinding reaction force of 50N.

[0044] The push rod 7 is rotatably connected to the tail of the whetstone 4. Under the rotational force of the cutter, the whetstone can rotate accordingly, which can not only sharpen the cutter, but also effectively prevent local wear caused by the fixed installation of traditional whetstones, thereby improving the service life and grinding uniformity of the whetstone. The through hole of the fixing bracket 10 provides linear guidance to ensure displacement accuracy.

[0045] The first spring 12 is made of 65Mn spring steel with a free length of 50mm and an adjustable compression range of 10-20mm. It provides a reset force of 0.5-1N and ensures that the whetstone 4 completes reset within 0.5 seconds when the power is off.

[0046] The second spring 13 is installed between the annular step of the electromagnet core 6 and the end face of the electromagnet 3, with its stroke limited to within 5mm to prevent the whetstone 4 from being over-fed and damaging the blade.

[0047] In one embodiment, an application example of a CNC cutting machine shows that the device can complete grinding while the cutter 2 is rotating, reducing the grinding time per cycle from 15 minutes in traditional manual grinding to 3 minutes, increasing equipment utilization by 80%, and avoiding the risk of manual contact with the rotating cutter, thus reducing the workplace accident rate by 100%.

[0048] By adjusting the rotating shaft of the grinding bracket 5, the grinding angle of different tools can be quickly switched. The adjustment time from saw blade (120°) to milling cutter (140°) is ≤1 minute, which is suitable for a variety of processing scenarios.

[0049] The specific workflow is as follows:

[0050] S1 Installation and Debugging: Fix the grinding tool holder 5 to the tool holder 1, adjust the rotating shaft so that the angle between the grinding head and the cutting tool 2 is 120°, tighten the fasteners, and after the push rod 7 is threadedly connected to the rotating shaft of the grinding stone 4, adjust the compression of the first spring 12 to 15mm.

[0051] S2 Automatic Grinding: During equipment operation, when the passivation detection system of cutter 2 sends a signal, the PLC controls the electromagnet 3 to be energized, and the grinding stone 4 is fed for grinding. After 90 seconds, the power is cut off and reset, completing one grinding cycle.

[0052] S3 Maintenance and Replacement: When the whetstone 4 is worn by more than 5mm, loosen the bolt 9, remove the push rod 7, then remove the whetstone at the front end of the push rod and replace it with a new whetstone. After readjusting the spring compression, continue to use it.

[0053] In summary, this device, through its mechatronics design, transforms the traditional manual knife-grinding experience into automated and precise control, providing a reliable guarantee for continuous production in machining and possessing significant industrial application value.

[0054] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An automatic knife sharpening device, comprising a sharpening assembly mounted on a knife holder (1) for sharpening the cutting edge of a cutting knife (2), characterized in that, The sharpening assembly includes an electromagnet (3) and a sharpening stone (4) mounted on a blade holder (1) via a sharpening bracket (5). The sharpening stone (4) is opposite to the cutting edge of the cutter (2), and the distance between the two is adjusted by the electromagnet (3).

2. The automatic knife sharpening device according to claim 1, characterized in that, An electromagnet core (6) is installed inside the electromagnet (3), and the electromagnet core (6) can be close to the cutter (2) when energized or away from the cutter (2) when de-energized. The end of the whetstone (4) away from the blade of the cutter (2) is connected to the free end of the electromagnet core (6) extending to the outside of the electromagnet (3) through the push rod (7).

3. The automatic knife sharpening device according to claim 2, characterized in that, One end of the push rod (7) is connected to the whetstone (4), and the other end of the push rod (7) is connected to the electromagnet core (6) through the connecting rod (8).

4. An automatic knife sharpening device according to claim 3, characterized in that, One end of the connecting rod (8) is flat and is inserted into and locked into the slot at the free end of the electromagnet core (6). The other end of the connecting rod (8) is ring-shaped and is snapped into the push rod (7) and locked with bolts (9).

5. An automatic knife sharpening device according to claim 3, characterized in that, The sharpening bracket (5) is equipped with a fixing frame (10) for supporting the push rod (7). The fixing frame (10) has a through hole that matches the push rod (7). The end of the push rod (7) away from the connecting rod (8) slides through the through hole and is rotatably connected to the tail of the sharpening stone (4).

6. An automatic knife sharpening device according to claim 5, characterized in that, A first spring (12) is fitted on the push rod (7), and the two ends of the first spring (12) are connected to the end faces of the connecting rod (8) and the fixing frame (10), respectively.

7. An automatic knife sharpening device according to claim 6, characterized in that, Both ends of the first spring (12) are equipped with movable rings (11), and the two movable rings (11) abut against the end faces of the connecting rod (8) and the fixed frame (10), respectively.

8. An automatic knife sharpening device according to claim 2, characterized in that, The free end of the electromagnet core (6) has an annular step, and the annular step surface is connected to the end face of the electromagnet (3) by a second spring (13).

9. An automatic knife sharpening device according to any one of claims 1-8, characterized in that, The end of the whetstone (4) near the blade of the cutter (2) is the grinding head. The cutter (2) is a disc-shaped tool. The angle between the grinding head and the disc of the cutter (2) is obtuse and the angle is adjustable.

10. An automatic knife sharpening device according to claim 9, characterized in that, The grinding bracket (5) is mounted on the side of the tool holder (1) via a pivot and the rotation angle is fixed by fasteners.

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